The most common way to say "expensive" in Spanish is "caro" (for masculine) or "cara" (for feminine). Other regional variations include "costoso" and "carísimo" (meaning very expensive). For example, "El coche es muy caro" means "The car is very expensive" and "La cena en ese restaurante es muy cara" means "The dinner at that restaurant is very expensive".

Summary of common translations:

• General: caro/cara
• Mexico: costoso
• Argentina: carísimo (very expensive)
• Spain: caro, costoso, and slang "carillo"

"Expensiva" or "expensivo" is not a standard Spanish word; it may appear as slang or playful usage but the correct term is "caro" or its variations.